#' @title LC-MS preprocessing result test data
#'
#' @description
#'
#' The `xdata` variable represent the results from a `xcms`-based
#' pre-processing of an LC-MS untargeted metabolomics data set. The raw data
#' files are provided in the `faahKO` package. The pre-processing of this data
#' set is described in detail in the *xcms* vignette of the `xcms` package.
#'
#' @name xdata
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